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https://issues.apache.org/jira/browse/HADOOP-17158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17182912#comment-17182912
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Mehakmeet Singh commented on HADOOP-17158:
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Hi [~bilahari.th], Thanks for the info.
I expected to see test failures with expected values compared to the actual
values rather than timeout error. I hope you have removed the whole "while"
condition block rather than just the sleep() method. If not, Can you please,
try with removing the whole "while" condition block from the test and the test
timeout limit, and then send the trace.
> Intermittent test timeout for
> ITestAbfsInputStreamStatistics#testReadAheadCounters
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-17158
> URL: https://issues.apache.org/jira/browse/HADOOP-17158
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/azure
> Affects Versions: 3.3.0
> Reporter: Mehakmeet Singh
> Assignee: Mehakmeet Singh
> Priority: Major
>
> Intermittent test timeout for
> ITestAbfsInputStreamStatistics#testReadAheadCounters happening due to race
> conditions in readAhead threads.
> Test error:
> {code:java}
> [ERROR]
> testReadAheadCounters(org.apache.hadoop.fs.azurebfs.ITestAbfsInputStreamStatistics)
> Time elapsed: 30.723 s <<<
> ERROR!org.junit.runners.model.TestTimedOutException: test timed out after
> 30000 milliseconds at java.lang.Thread.sleep(Native Method) at
> org.apache.hadoop.fs.azurebfs.ITestAbfsInputStreamStatistics.testReadAheadCounters(ITestAbfsInputStreamStatistics.java:346)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498) at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
> at
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
> java.lang.Thread.run(Thread.java:748) {code}
> Possible Reasoning:
> - ReadAhead queue doesn't get completed and hence the counter values are not
> satisfied in 30 seconds time for some systems.
> - The condition that readAheadBytesRead and remoteBytesRead counter values
> need to be greater than or equal to 4KB and 32KB respectively doesn't occur
> in some machines due to the fact that sometimes instead of reading for
> readAhead Buffer, remote reads are performed due to Threads still being in
> the readAhead queue to fill that buffer. Thus resulting in either of the 2
> counter values to be not satisfying the condition and getting in an infinite
> loop and hence timing out the test eventually.
> Possible Fixes:
> - Write better test(That would pass under all conditions).
> - Maybe UT instead of IT?
> Possible fix to better the test would be preferable and UT as the last resort.
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